After a plane crash in the Japanese mountains, its only survivor—a baby named Andrew—is adopted by a samurai master. Andrew, along with the samurai's son, Kenjiro, are trained in the warrior’s way. Andrew excels in his training and soon surpasses his stepbrother’s skills. Kenjiro's jealousy pushes him to join the Yakuza, where he takes the Yakuza oath and forsakes the moral values of the samurai’s code. He leaves his father’s home, swearing to one day take revenge on his brother.